A line is a mark made by a moving point. It is the most basic element of drawing and can be used to create shapes, forms, and values.

A shape is a two-dimensional area enclosed by lines, while a form is a three-dimensional object that has height, width, and depth. Shapes can be created by lines, and forms can be created by shapes. Shapes are flat, while forms have depth.

Value is the lightness or darkness of a color. It is one of the most important elements of drawing, as it can be used to create form, depth, and atmosphere.

Color is the hue, saturation, and temperature of a light. Hue is the pure color, such as red, blue, or green. Saturation is the intensity of the color, such as bright or dull. Temperature is the warmth or coolness of the color, such as warm or cool.

The three main types of lines in drawing are straight, curved, and zigzag. Straight lines are lines that go in one direction without changing direction. Curved lines are lines that change direction smoothly. Zigzag lines are lines that change direction abruptly.

The three main types of shapes in drawing are geometric, organic, and abstract. Geometric shapes are shapes that have regular, defined edges, such as squares, circles, and triangles. Organic shapes are shapes that have irregular, flowing edges, such as leaves, flowers, and animals. Abstract shapes are shapes that are not found in nature or in the real world.

The three main types of forms in drawing are spherical, cylindrical, and cubical. Spherical forms are forms that have a round shape, such as balls and spheres. Cylindrical forms are forms that have a long, thin shape, such as cylinders and tubes. Cubical forms are forms that have a square or rectangular shape, such as cubes and boxes.

The three main types of values in drawing are light, dark, and medium. Light values are values that are close to white, such as highlights and light grays. Dark values are values that are close to black, such as shadows and dark grays. Medium values are values that are in between light and dark, such as midtones.

The three main types of colors in drawing are primary, secondary, and tertiary. Primary colors are colors that cannot be created by mixing other colors, such as red, blue, and yellow. Secondary colors are colors that are created by mixing two primary colors, such as green, orange, and purple. Tertiary colors are colors that are created by mixing a primary color and a secondary color, such as red-orange, blue-green, and yellow-green.

Positive space is the area of a drawing that is occupied by an object, while negative space is the area of a drawing that is not occupied by an object. Positive space is often the focus of a drawing, while negative space can be used to create depth, atmosphere, and movement.

Warm colors are colors that are associated with fire, such as red, orange, and yellow. Cool colors are colors that are associated with water, such as blue, green, and purple. Warm colors can be used to create a sense of energy, excitement, and passion, while cool colors can be used to create a sense of calm, peace, and tranquility.

Light values are values that are close to white, such as highlights and light grays. Dark values are values that are close to black, such as shadows and dark grays. Light values can be used to create a sense of brightness, cheerfulness, and optimism, while dark values can be used to create a sense of mystery, drama, and suspense.

Primary colors are colors that cannot be created by mixing other colors, such as red, blue, and yellow. Secondary colors are colors that are created by mixing two primary colors, such as green, orange, and purple. Primary colors are often used to create a sense of energy, excitement, and passion, while secondary colors can be used to create a sense of calm, peace, and tranquility.

Tertiary colors are colors that are created by mixing a primary color and a secondary color, such as red-orange, blue-green, and yellow-green. Complementary colors are colors that are opposite each other on the color wheel, such as red and green, blue and orange, and yellow and purple. Tertiary colors can be used to create a sense of depth and dimension, while complementary colors can be used to create a sense of contrast and excitement.